Patent GB-463975-A (GB)
Title: Improvements relating to apparatus for setting up code permutations, particularly applicable to telegraph instruments
IPC: H04L15/34
Filed: 1935-10-08
Abstract: 463,975. Type-printing telegraphy. CABLE & WIRELESS, Ltd., and WARBURTON, F. Oct. 8, 1935, No. 27823. [Class 40 (iii)] In printing-telegraph apparatus for receiving code signals of unequal length, permutation bars are selectively shifted under the control of a power-driven actuator which oscillates at signal element speed and acts through interposed members which are unlatched in succession as long as a signal persists. The apparatus described is adapted for receiving cable morse, and modifications for dealing with Wheatstone morse are referred to. The receiving relay RR connects up one or other of two magnets 1, 2 according as the signal impulse is positive or negative in series with a magnet 3. The latter controls an armature 6 lying normally in the path of the actuator 7, which is pivoted on a frame 8 moved up and down at signal element speed from a power shaft 84. As long as a signal persists therefore the armature 6 is intermittently withdrawn, but during intervals between signals the actuator strikes the armature and rocks about its pivot. The forward movement of the actuator 7 immediately before a signal causes its transverse bar 7a to strike a projection 16 on a latch 14, allowing the first member 19 to move forward so that it is depressed by the subsequent downward movement of the bar 7a when the first impulse is received. The depression of the first member 19 unlatches the second member, and so on, and each member 19 as it rises swings slightly due to engagement with a frame 32 to re-engage its latch 14. At the end of the signal, the forward movement of the actuator swings a frame 50 backwardly to restore the remaining unlatched member 19. Six pairs of permutation bars 56 are controlled by pairs of L-shaped levers 37, 38 pivoted on levers 22, on the other ends of which the members 19 are pivoted, so that the pairs of levers are raised into engaging position in succession, and one or other is rocked to shift the appropriate bar by a cross-piece 47 or 48 carried by the armature of the responding magnet 1 or 2. A bar 251 is shifted in the event of two signals running together, the corresponding operative lever being rocked whether the impulse is positive or negative. At the end of a signal the forward movement of the actuator 7 acts through a link 76 to shift the space bar 74. The displaced bars are held by latches 73, and a series of exploring blades 72, one for each possible signal, carried by a shaft 79 are swung forward periodically by an eccentric on the shaft 84 to seek the notches in the bars. After the space bar is shifted, one of the blades 72 enters the aligned notches and brings about printing as described in Specification 463,977. The space bar shifts a frame 91 into the path of an oscillating lever 87 so that the bars are milatched shortly after the blades are withdrawn. Single permutation bars may be employed, each bar being shifted or remaining stationary according to the kind of impulse. Modification for dealing with Wheatstone morse. Ten permutation bars 56 are associated with ten members 19, and a single responding magnet controls a stop in the downward path of the L-shaped levers. For a dot, the stop is restored while the lever is still raised and engages it during the downward movement, causing a bar to be shifted. For a dash, which is three times as long, two levers are raised and lowered, only the second being effective in shifting the appropriate bar. Specification 463,976 also is referred to.